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Troubleshooting installation errors caused by corrupted setup files

If you see the error Package Broken or Not a Valid Win32 Application when trying to run installation of an Avast product on your Windows PC, the setup file may be corrupted or incomplete. To fix this issue, follow the steps in this article.

Other Avast products for Windows

Ensure the setup file is whole and uncorrupted

If the error continues to appear, check the integrity of the setup file you have downloaded:

Go to the folder where you saved the avast_(...)_setup_(...).exe setup file (by default, all files are saved to your Downloads folder). The file name includes the name of your Avast product and either online or offline, for example avast_internet_security_setup_offline.exe.

Right-click avast_(...)_setup_(...).exe and select Properties.

Go to the Digital Signatures tab. You should see either 1 or 2 digital signatures from AVAST Software s.r.o..

If you don't see the Digital Signatures tab, your setup file is incomplete or corrupted. Find solutions in the I have no Digital Signatures tab section of this article.

Click a digital signature to select it, then click Details.

Locate the message displayed below Digital Signature Information. Depending on which message you see, refer to the relevant instructions below.

If you see This digital signature is not valid in one or both digital signatures, your setup file is incomplete or corrupted. Try the following solutions:

Download your Avast setup file on a different PC (using the relevant link from this article) and then transfer the file to your original PC using a USB or portable hard drive.

Refer to the relevant installation article and ensure you followed all steps accurately:

If you see This digital signature is OK in all digital signatures, your setup file is whole and uncorrupted. In this case, there is another reason why the setup file failed to download. Try the following solutions:

Close all other applications and antivirus software which may be running in the background, then download the file again using the relevant link from this article.

Refer to the relevant installation article and ensure you followed all steps accurately: